Light concentrating reflector camera



:nmentor 4/5555 7 uuocx Gttorneg J- T. BULLOCK LIGHT CONCENTRATINGREFLECTOR CAMERA Original Filed Sept. 16, 1946 1 I 1 I z Dec. 19, 1950Patented Dec. 19, 1950 LIGHT .GONCENTRATING REFLECTOR CAMERA 'Jesse'T.Bullock, Kansas City, Kansaassignor of one-third: to Andrew J.Bramlette, Los Angeles, and one 'third: tov William R. Harriman; Hondo,

Calif.

TOriginal applicationseptember.16, 1946, Serial N'o.f697,20'5. 'Dividedand' this application July "21, 1947,"S'erlal-No;' 762,379

zlllaims.

"This invention relates to cameras and like'devices and contemplates theprovision of novel optical means for effecting:eflicientt'transmissionand concentration of light upon a light sensitive film or plate. Thisapplication is a division of my pending application entitled RayTransmitting and Concentrating Devices, Serial :No. 697,205, and filedSeptember 16, 1946 and now abandoned.

The present invention has for an object to provide a camera or the likeembodying novel-and improved reflecting means for focusing lightaupon afilm within the camera.

Another object of the invention is to provide a camera or similardevicesuch"as a'photmenlarger and to embody therein paraboloidlightreflecting means for concentrating-rand: focusing? light upon asensitized film or plate within thecamera.

A further object of the invention is to provide a camera as indicated,in which the paraboloid reflecting means is adjustable.

'My invention hasalso' for itsobjects to provide such means that arepositive in operation, convenient in use, easily installed in a workingposition and easily disconnected therefrom, economical of manufacture,relatively simple, and of gen eral superiority and serviceability.

The invention also comprises novel details of construction and novelcombinations and arrangements of parts, which will more fully appear inthe course of the following description. However, the drawings merelyshow and the following description merely describes embodiments of thepresent invention, which are given by way of illustration or exampleonly.

In the drawings, like reference characters designate similar parts inthe several views.

Fig. 1 is a semi-diagrammatic cross-sectional view of a camera embodyingfeatures of the present invention and adjusted to transmit a converginglight beam.

Fig. 2 is a cross-sectional view showing a modification of theparaboloid reflecting means employed in the camera.

Fig. 3 is a front view thereof.

The mentioned pending application discloses means involving theprinciple of receiving rays on the concave surface of a centrallyapertured parabolic reflector, reflecting said rays onto the convexsurface of a smaller parabolic for transmission of said rays inresulting concentrated form through the mentioned aperture. Thus, asexplained in said application, incoming parallel rays can be transmittedas a parallel beam or as a converging beam, or incoming converging or i2 diverging-rays-canbe transmitted as aparallel beam by the simplerelative adjustment of the positions of the-reflectors. By positioningthe reflectors-so their'focal points coincide, parallel raytransmissionis effected and by adjusting said reflectors, relatively, eitherconverging or divergin'gray transmissionis obtained. The principlesoutlined,r'further, contemplate slight 'modiflcation 'of-eitherreflector for obtainingthe type .of ray transmission desired.

In? the :embodiment of the invention which is illustrated in: Fig- 1,thecamera comprises, generally, -a :larger concave parabolic reflector Whaving-a central-aperture or opening I I, a smaller convexrparabolicreflector I2 normally positioned sothat-its focal point and that ofreflector I0 coincide at' at point I3, a transparent cover II arrangedto enclose-both reflectors to protect adiustable means I5 carried bysaidlens foramcving reflector I2 toward and from reflector randthereby-varying the character of the light beam:entering theaperture II,a tube.- I6 extendingrrearward-of:saideaperture and enclosing the same,a conventionalcamera shutter I'I .within said tube intermediate itslength, means I8 for removably supporting a light sensitive film orplate I9 rearward of said shutter, and means 25 for controlling theaperture I I and preferably located adjacent thereto.

The reflector III is truly parabolic or somewhat modified as outlined inthe stated principles of the invention. Its effective concave surface isadapted to receive light rays 20 and reflect them onto the convex faceof reflector I2. The latter reflector is simply a smaller replica ofreflector I0 except that a central aperture is omitted. The point I3,being the common focal point of the reflectors, the parallel rays 20,reflected as rays 2| toward the smaller reflector I2, will be reflectedby the latter, as a parallel beam 22, through opening II. i

The means I5, which comprises a screw 23 and an operating head 24thereon, passes through cover I4 and carries reflector I2. Manipulationof head 24 causes movement of reflector I2 toward and from reflector IIIto change the beam 22 to a converging or diverging beam, as the case maybe. Fig. 1 shows adjustment of reflector I2 to provide a converginglight beam 22.

The shutter I1 and the film or plate supporting means I8 may begenerally conventional for such means. The means 25 may compriserelatively rotatable light polarizing filters 26 for controlling theamount or degree of light entering tube I6 through aperture II.

The cameraabove described may be variously modifie'd."-' Instead of thecompletely circular reflector shown," only such portions thereof thatare necessary to transmit light, may be provided. As seen in Figs. 2 and3, the convex reflector 21 may comprise a suitable portion or segment ofa completely circular reflector and the concave reflector 28 may embodyonly such portions that receive light rays transmitted by reflector 21.Accordingly, the camera housing can be more compactly designed aboutsuch reflector portions. It will be noted that the point 29 Which is thecommon focal point of reflectors 21 and 28 is located on the axis ofgeneration of the peripheral edges of said reflectors.

While I have illustrated and described what I now regard as thepreferred embodiments of my invention, the construction is, of course,subject to modifications without departing from the spirit and scope ofmy invention. I therefore, do not wish to restrict myself to theparticular formsoi' construction illustrated and described, but desireto avail myself of all modifications that ma fall within the scope ofthe appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is: 1. A camera comprising, in combination, a concaveparabolic reflector having'a central lightpassing opening, a smallerconvex parabolic reflector located centrally within the concavereflector and in front of the opening therein, a transparent covercompletely enclosing the lightreceiving surface of the concave reflectorand, thereby, enclosing the convex reflector, adjusting means connectedto the latter reflector and carried by and extending through said coverfor effecting adjustment of the two reflectors, relatively, lightreceived by the concave reflector being reflected to the convexreflector and transmitted by the latter through the mentioned opening inthe former, light-polarizing means across said opening, and a shutterand film-holding assem-bly in the path of the polarized light passed by.the light-polarizing means.

2. A camera comprising, in combination, a concave parabolic reflectorhaving a central lightpassing opening, a smaller convex parabolicreflector located centrally within the concave reflector and infront ofthe opening therein, a transparent cover completely enclosing thelightreceiving surface of the concave reflector and, thereby, enclosingthe convex reflector, adjusting means connected to the latter reflectorand carried by and extending through said cover for effecting adjustmentof the two reflectors, relatively, light received by the concavereflector being reflected to the convex reflector and transmitted by thelatter through the mentioned opening in the former, light-polarizingmeans across said opening, a tubular housing extending from the concavereflector in the direction of light transmitted by the convex reflectorand aligned with the opening in the concave reflector, a removableretainer engaged with the end of the housing for film disposed Withinsaid housing,

and a shutter in the housing between the film and light-polarizingmeans.

JESSE T. BULLOCK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 697,738 Miller Apr. 15, 1902753,351 Beidler Mar. 1, 1904 2,282,869 Johnson et a1. May 12, 19422,336,379 Warmisham Dec. 7, 1943 2,403,660 Hayward July 9, 19462,413,286 Buchele Dec. 31, 1946 2,430,595 'Young Nov. 11, 1947 FOREIGNPATENTS Number Country Date 3,058 Great Britain Nov. 19, 1903 29,282Great Britain of 1909 France Mar. 10, 1910

